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1 // Copyright 2004, 2005 The Apache Software Foundation2 //3 // Licensed under the Apache License, Version 2.0 (the "License");4 // you may not use this file except in compliance with the License.5 // You may obtain a copy of the License at6 //7 // http://www.apache.org/licenses/LICENSE-2.08 //9 // Unless required by applicable law or agreed to in writing, software10 // distributed under the License is distributed on an "AS IS" BASIS,11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.12 // See the License for the specific language governing permissions and13 // limitations under the License.14 15 package org.apache.tapestry.services;16 17 importorg.apache.tapestry.IEngine;18 19 /**20 * Service responsible for obtaining instances of {@link org.apache.tapestry.IEngine}21 * to service the current request. An engine service may be retrieved from a pool, or extracted22 * from the HttpSession. After the request is processed, the engine is re-stored into the23 * HttpSession (if stateful) or back into the pool (if not stateful).24 *25 * @author Howard Lewis Ship26 * @since 4.027 */28 publicinterface EngineManager29 {30 /**31 * Locates or creates an engine instance for the current request.32 */33 IEngine getEngineInstance();34 35 /**36 * Store the engine back at the end of the current request.37 */38 39 void storeEngineInstance(IEngine engine);40 }41